GPS高层建筑物常荷载振动测试的小波分析

具有高采样率的GPS接收机的出发，使得GPS技术可以用于大型工程结构（如：大桥，高塔和高层建筑物等）的动态位移监测，其突出优点是GPS可以直接测定工程结构的绝对位移以用于结构的动力特性评估。但应用GPS技术也有其弱点和不足，譬如GPS技术本身的各类误差影响源，必须有效地消除。对于高层建筑的动力特性研究，由于GPS基线可以尽可能地设置得短些，所以其关键的误差影响源于多路径。本文主要研究深圳地王大厦常荷载条件下结构振动GPS测试的有关问题，由于常态下振动的幅值只有1－2毫米，被其它影响源所掩盖，一般难以识别。本文采用小波分析法进行处理，可以有效地识别和提取微小振动，取得很好的效果。

WAVELET-BASED ANALYSIS TECHNIQUE FOR THE MONITORING OF TALL STRUCTURE UNDER NORMAL LOADING USING GPS

With the development of GPS receiver technology for high recording rate,it allows reliable monitoring of engineering structures,such as suspension bridges,towers and tall buildings.The distinctive advantage is that relative displacements can be measured to access the stress and drift of engineering structures,but accuracy of GPS positioning is affected by many error sources or biases,e.g.satellite and receiver related clock error,orbital errors,atmospheric delay,and multi-path.The relatively smaller amplitude of structure vibration may usually be hidden from view.The paper presents a wavelet-based analysis technique for this application and results from field experiment data acquired at a tall building(309.95m from ground level)shows that small amplitude of 1～2mm at normal loading condition can effectively be identified.